Effects of coral, recycled and natural coarse aggregates on the mechanical properties of concrete

Huang, Yijie; He, Xujia; Sun, Hao; Sun, Yuedong; Wang, Qing

doi:10.1016/j.conbuildmat.2018.10.111

Cited by 101 publications

(19 citation statements)

References 21 publications

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“…Da et al (2016b), Huang et al (2018), Wang et al (2017a), and Zhou et al (2020) conducted uniaxial compression tests on CAC specimens with dimensions of 100 × 100 × 300 mm, and obtained similar compressive stress-strain curves (see Figures 8–10). When the stress reaches the peak point, the curve drops suddenly, and the load immediately falls below 20% of the peak value.…”

Section: Mechanical Propertiesmentioning

confidence: 80%

“…Another significant difference between CAC and NAC is the uniaxial compressive strength ( f c )-to-cubic compressive strength ( f cu ) ratio. For CAC, the ratio f c / f cu is generally greater than 0.9, or even close to 1.0 (Huang et al, 2018; Zhou et al, 2018), while it is approximately 0.76 for NAC (Ye, 2002). This is because the friction coefficient between the CAC and the loading plate of the testing machine is lower than that of the NAC; therefore, the hoop effect caused by friction is weakened (Yang et al, 2018b).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…During the loading process, localized macro cracks initiate from the location of the coarse aggregates instead of the dispersed microcracks on the concrete surface. After reaching the peak compressive stress, there is a sudden loss of strength, which is more brittle than the NAC with the same strength level (Da et al, 2016b; Huang et al, 2018; Wang et al, 2017a). The failure cracks always pass through the coarse aggregates, resulting in a few discrete parts with relatively smooth surfaces after the tests (Yuan, 2015), as shown in Figure 7.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…According to their test results, Da et al (2016b), Huang et al (2018) and Zhou (2020) proposed two-branch constitutive models (Table 2), both with a polynomial function describing the ascending branch and a fraction equation describing the descending branch. The comparison between the experimental curves and the fitting curves is shown in Figures 10 and 11, respectively.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Zhou

Feng

Yang

2020

Advances in Structural Engineering

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As an economical and eco-friendly construction material, coral aggregate concrete (CAC) plays an increasingly important role in emerging marine engineering applications. CAC fully utilizes local raw materials on remote islands. Due to the porous structure and low-strength characteristics of coral aggregates, CAC exhibits unique characteristics compared to ordinary concrete. This paper presents a state-of-the-art review of the properties of CAC, including (1) the physical properties of coral aggregates; (2) the mechanical properties of CAC under uniaxial and multiaxial compression; and (3) the durability of CAC especially its chloride ion resistance and performance under drying-wetting cycles. To overcome the challenges of steel corrosion in marine environments, fiber-reinforced polymer (FRP) has been indicated to be a promising material for applications in CAC construction. The latest studies on the combination of FRP and CAC are reviewed, including the use of FRP tubes and bars.

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Section: Mechanical Propertiesmentioning

confidence: 80%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Zhou

Feng

Yang

2020

Advances in Structural Engineering

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“…Nevertheless, strength usually gives an overall picture of the quality of concrete because strength is directly related to the structure of the hardened cement paste [3]. Other factors that considerably influence properties of concrete include aggregates used in the concrete [1], their sizes and their texture [4,5], whether angular or subangular, other factors include the type of cement used, the watercement ratio used the method of mixing and curing, relative humidity, temperature, etc. These factors must be adequately controlled or regulated to ensure that the desired concrete properties are achieved [6,7].…”

Section: Introductionmentioning

confidence: 99%

Compressive strength of re-vibrated concrete made from pebbles

Mahuta

Aku

2020

E3S Web Conf.

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The search for natural and readily available structural material to meet the growing demand for ecologically friendly and smart structures is an ongoing development. In this background, an experimental study into the compressive strength of re-vibrated concrete made from pebbles as coarse aggregate is presented. Fifty-six (56) concrete cubes were cast adopting a re-vibration time lag interval of 10minutes for one hour, with a target strength of 15N/mm2. This comprised 28 cubes 100% granite and 28 cubes 100% pebbles as coarse aggregates respectively. Two curing ages were considered: 7 and 28 days. Results from the compressive strength tests of the cured specimens showed that: at successive time lag intervals there was an appreciable rise in compressive strength of concrete; observable was also a rise in the compressive strength with an increase of curing age. However, even though the maximum compressive strength of 25.64N/mm2 for 100%granite was achieved, that of 100%pebbles attained 23.33N/mm2, both at 60th minute of re-vibration time lag respectively. Hence, it can be suggested that 100% pebbles replacement for granite can be used to produce concrete with compressive strength of up to 23N/mm2 when revibrated.

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Residual fracture energy of natural and recycled aggregate concrete after exposure to high temperatures

Chen

Peng

Yang

et al. 2022

Structural Concrete

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Fracture energy (GF) represents the average total energy consumed in the whole process of crack propagation. Using one parameter of GF, it is not sufficient to describe the fracture behavior during crack stable and unstable propagation periods. In this study, the GF, stable fracture energy (GFS) and unstable fracture energy (GFU) of natural and recycled aggregate concrete (RAC) were investigated by using three‐point bending tests. Totally, 128 cubic specimens (100 mm × 100 mm × 100 mm) and 64 notched beams with size of 510 mm × 100 mm × 100 mm were manufactured to test the compressive strength (fcu), splitting tensile strength (ft), load–deflection (P‐δ), and load‐cracking mouth opening displacement (P‐CMOD) curves, considering different replacement levels (0%, 30%, 70%, and 100%) of recycled coarse aggregate (RA) and high temperatures exposure (20, 100, 200, and 300°C). The effects of RA substitutions and temperatures on basic mechanical properties, GF, GFS, and GFU were analyzed. The results demonstrated that the fcu, ft, and elastic modulus (E) decreased with the incremental temperature. The GFS of concrete with different RA substitutions first decreased and then increased, and the minimum value appeared at 200°C. The GF and GFU of concrete with different RA substitutions increased with the elevated temperature, and the increase rate decreased with RA substitutions. When the temperature is less than 100°C, the GF and GFU of concrete remained mostly unchanged with the increase of RA substitutions, while the temperature reached 200 and 300°C, the GF and GFU of concrete increased and decreased with the increase of RA substitutions, respectively.

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Effects of coral, recycled and natural coarse aggregates on the mechanical properties of concrete

Cited by 101 publications

References 21 publications

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Compressive strength of re-vibrated concrete made from pebbles

Residual fracture energy of natural and recycled aggregate concrete after exposure to high temperatures

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